Cold-Cast Anchor Stay Cable with Embedded Fiber Grating Sensor
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Solution Overview
Problem
Existing cable force detection methods for steel strand stay cables in bridges suffer from poor stability, low survival rate, and durability issues, making long-term monitoring challenging due to external interference and instability.
Innovation Solution
A cold-cast anchor stay cable with a spot welding high-temperature grating sensor integrated into the steel strands, buried within an extension structure, which measures strain and is protected by a sealant and epoxy mortar, reducing external interference and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cable force detection sensors are used, then cable force measurement is achieved, but stability and durability are poor due to external interference
Solution Approach 1:
The fiber grating sensor is embedded within the steel strand structure, with the sensor protected by corrosion-resistant coating and integrated into the cable assembly. This nesting approach shields the sensor from external environmental factors while maintaining measurement capability, directly resolving the contradiction between reliability and external interference
Solution Approach 2:
The patent uses composite material structures including corrosion-resistant coatings on steel strands and integrated sensor protection layers. These composite structures provide both mechanical strength and environmental protection, enhancing stability while resisting external interference such as corrosion and physical damage
2Reliability
If traditional sensors are installed on stay cables, then cable force detection is possible, but survival rate and durability are low during installation and operation
Solution Approach 1:
The fiber grating sensor is merged with the steel strand structure through embedding and protective coating integration. This combination ensures that the sensor and protective structures work together as a unified system, enhancing durability and extending service life by preventing sensor degradation from environmental exposure
Solution Approach 2:
Corrosion-resistant coatings and protective structures are applied beforehand to the steel strands and sensor assembly. This preliminary protection cushions the sensor against future environmental damage during installation and long-term operation, directly improving both durability and service life
3Measurement precision
If frequency method is used for long-term monitoring, then cable force monitoring is achieved, but measurement accuracy is insufficient
Solution Approach 1:
The patent replaces mechanical frequency-based measurement systems with optical fiber grating sensors that use optical interference patterns for measurement. This substitution provides higher measurement precision while maintaining long-term monitoring capability, as optical sensors are more sensitive to strain changes and less susceptible to environmental factors affecting mechanical systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides stable, real-time, and accurate long-term monitoring of cable forces, reducing creep phenomena and sensor damage, while enhancing measurement accuracy and service life.
Implementation Method 1
a spot welding high-temperature grating sensor is fixedly connected to a side surface of a part of one of the steel strands located in the extension structure
Implementation Method 2
epoxy mortar is poured between the cover plate and the cable band; a sealant is poured into the extension cylinder
Implementation Method 3
a spot welding high-temperature grating sensor is fixedly connected to a side surface of a part of one of the steel strands
Data Source
AI summary
A cold-cast anchor stay cable containing fiber grating strain and an installation method are provided. The stay cable includes an anchor head structure, where one end of the anchor head structure is fixedly connected with an extension structure, one end of the extension structure away from the anchor head structure is fixedly connected with a cable body, and a plurality of steel strands are fixedly connected inside the anchor head structure, and the steel strands sequentially pass through the anchor head structure and the extension structure and are fixedly connected with one end of the cable body. A spot welding high-temperature grating sensor is fixedly connected to a side surface of a part of one of the steel strands located in the extension structure.